A device which controls the voltage and current being delivered to a capacitor or battery.

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21 views

Plugging battery backup and AC/DC converter into the same battery

Today, I took one of the UPS (UPS A) the battery out and directly plugged it to bigger 12V battery (so if the electricity is out it stays long). And I also have AC/DC 2000Watt inverter. That inverter ...
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1answer
14 views

SIM908 Li-Ion charging with 6V solar panel

So, I want to know if I can hook up a 6V 2 watt solar panel to the Vchg pin on a SIM908 gsm/gps module and trickle charge my 6Ah LiPo battery that way. A little background... So, I have completed ...
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0answers
28 views

Trying to create a USB dongle with OTG and charging capabilities

I'm trying to create a USB-OTG dongle that can pretty much do this: http://accessories.dell.com/sna/productdetail.aspx?c=us&cs=19&l=en&sku=470-abes That's the Dell Micro USB Dongle for ...
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1answer
75 views

How are these AA batteries 4500 mAh?

I found these two batteries in a drawer while looking for batteries for my wireless mouse. I was surprised to see that they are 4500 mAh, which is much higher than any AA battery I could find on the ...
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2answers
53 views

How does this wireless charger work?

I want to understand the way this circuit works. The following are diagrams of the transmitter and receiver of a wireless iPod charging circuit. I have added a link to the instructable that describes ...
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1answer
68 views

LM317 3.7 v battery charger

I have build simple LM317 power supply.Input is 12v (I am using computer power supply), and the output is around 4v .I was ...
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4answers
99 views

Circuit Validity

The following is a circuit I have tried simulating on multisim. The LED on the transmitter part does not light up. The current is 0 through that LED. Is it legitimate?
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1answer
95 views

Lost in desert - charge the phone with car battery [closed]

First of all I'm not a student nor a engineer. Pretend I'm lost in the desert with just a car with a broken engine. The battery of my phone is over. Is there any chance I can survive (charging the ...
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1answer
50 views

Power a laptop LED backlight with NiMH batteries

I'm powering a laptop LED backlight with an external 24,8V power supply, because I have problems with the internal WLED driver. The display used to work at 27V, but with the 24,8V of the power supply ...
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2answers
53 views

High Cell Count LiPo Balancer/Charger

How would I go about balance charging either 100 or 75 lipo cells? This is a very serious question by the way, it's for an electric vehicle and we use either 75 or 100 cells at a go and currently ...
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2answers
64 views

mobile battery charging using voltage regulator?

Circuit shown at http://www.instructables.com/id/9v-USB-charger/ will that satisfy all condition of mobile charging through usb ? what is advantage of circuit shown at ...
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1answer
142 views

Turn Laptop Battery to a Power Bank

Is it possible to turn a laptop battery into a power bank? I have seen video tutorials and articles on how to turn AA Batteries into power banks, however, no one has created a power bank using a ...
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1answer
69 views

We're making a bike-powered USB charger and we have (almost) no idea what we're doing

So my friend and I are going to build a USB charger powered by a dynamo. Here is a diagram of what we are planning to do. I have a few questions: 1.) How do we test if the dynamo and breadboard ...
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1answer
82 views

Need to make a laptop charger [closed]

I am not an electrician. My laptop's charger burned when we had high voltage 2 days ago. My laptops charger says Output is: 19.5 V and 9.23 A. I am in a country that you can't easily find those kinds ...
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2answers
88 views

5 volt generator

first time question, and not much of an electrical guy. so please be patient. My dad however, is an electrical engineer, who loves little goofy gadgets as most engineers do. For Christmas I want to ...
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1answer
56 views

Charge a Lipo battery and power a circuit

I purchased this LiPo charger and I plan to connect the GND and BAT connections to the battery and an external circuit at the same time. In the datasheet the reference drawings are for battery ...
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1answer
46 views

Charging appliances with chargers of different amperage (safety & duration)

Safety Will the battery or charger be damaged if I use a 1A charger to charge a 2.1A appliance? Will the battery or charger be damaged if I use a 2.1A charger to charge a 1A appliance? Duration I ...
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1answer
57 views

Identifying a four-pin IC labelled EL 8+7 G8025

I want to know the purpose of a component named "EL 8+7 G8025" which was found inside a Nokia charger.
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1answer
78 views

lm2596 fixed 5 volts(usb) from 12v 10W solar panel

I have got a 10 Watt solar panel & a 10000 mha Battery bank. I plan to use the panel to charge the battery bank. I have a LM2596(variable configuration with pot), I plan to use it to charge my ...
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1answer
48 views

Do AA battery chargers detect battery charge level and automatically turn off when full? [closed]

When I put in AA batteries for charging, do I have to remember to disconnect the charger after the specified number of hours, or does the charger detect the charge level and automatically turn off ...
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1answer
90 views

Why are 5 Volt 7-8 Amps chargers not available for charging phones quickly? [closed]

Available phone s chargers have either 0.5, 1, 2 Amps rating depending on the batteries (varied capacity) used. Why is it that 7, 8 Amps chargers are not available ? if the limitation is in the ...
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2answers
101 views

My voltage multiplier (cockroft-walton) will not charge my capacitor bank past 150v. How can I fix this?

I got 5 free 450v 4700uf capacitors that I put in parallel to form a 23500uf 450v capacitor bank (2.4kJ) in hopes of building a can crusher and later a railgun. I built a voltage tripler from four ...
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2answers
203 views

How does a USB 2.0 Wall Charger negotiate current output?

I'm trying to use a mobile phone charger for my projects, and want a high current output. I have read this, however my measurements show something else. Here is a link to the Battery Charging ...
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1answer
74 views

NiMH battery charger using discrete elements

Below is a schematic of NiMh battery charger that must automatically switch off charging current when battery is fully charged. I am aware that the main part of this scheme is current source, build ...
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2answers
98 views

Issue charging a 12V battery using solar charger

I bought a 12V solar charger for vehicle batteries, because I am usually using wall chargers and I wanted to give green technology a try. When I connect the solar charger to my battery, it shows 10V, ...
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1answer
514 views

How can I extend this circuit to use it in our real life?

I am planning to design a wireless mobile charger circuit next week. For that purpose, I have selected the circuit which is shown below and is collected from the post: wireless mobile battery charger. ...
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2answers
344 views

Supercap charging circuit for RTC backup on STM32

I'm asking for a reliable/simple/cheap circuit for the VBAT section of a STM32 design, powered at VDD=3.3V, that will safeguard the built-in RTC (based on 32768 Hz Xtall) for like 10 days. Based on ...
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4answers
219 views

Battery-Operated Mobile Charger

I want to build a mobile charger that is battery operated and found this diagram. At first glance, this diagram looks kinda simple and I thought that this won't work. I'm a newbie on making this kind ...
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3answers
160 views

Rate my Rasberry Pi UPS

I've made simple schematic for a UPS for Raspberry Pi. It contains a 12V Lead Acid Battery (40Ah), 5V LM7805 regulator and some capacitors. I'm supposing max 1.2A load from Raspi. Should I add ...
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2answers
94 views

How to reduce voltage of a dynamo to 5 volts

A friend and I are going to make a bike-powered charger. There is a video of KipKay making one. But he uses a 12 volt 6 watt dynamo and there is a schematic that he follows to lower it to 5 volts. Can ...
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1answer
167 views

How to fix exposed wire at the end of a laptop charge with electrical taper [closed]

I have a Toshiba L505D-S5965 with Windows 8.1. My charger has exposed wire at the end but it was working until a few days ago. It's at the part where it's plugged to the laptop charger port. Now it ...
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3answers
99 views

Method to lower voltage of a laptop charger

I bought an IMAX B6 LiPo Balance charger that needs as input 11-18V but I have an unused laptop charger (the laptop is gone) having 19V with 4.74A. What is the easiest method to lower the voltage to ...
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2answers
118 views

Charging supercapacitors with Buck converter. Do I need to cut power once charge is reached?

I am trying to build a supercapacitor charger, and as I don't particularly have a good handle on the risks of such a thing, I'm hopping on here to give some information. I am using a buck converter ...
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1answer
113 views

Question on 3DS power adapters, minor voltage difference [duplicate]

I am going to be traveling overseas and bringing my Nintendo 3DS which the adapter outputs DC 4.6V 900mA. I found an unofficial USB cable to charge it and I was curious if the minor variance in the ...
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3answers
198 views

Will a dual car charger that shows a maximum output of 2000mA produce a 2.1A current?

I have a dual car charger that states input is 12-24VDC and Output is maximum of 2000mA, but it is supposed to have one port charge at 1A and other port charge at 2.1A. Is the 2.1A output possible ...
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4answers
101 views

What is this electronics component?

What is the yellow component shown here? This is off a Outlet USB phone charger.
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1answer
94 views

LiPo Charger question [closed]

I'm not into electronic so this is why I ask people who know. I have an opportunity to buy a 5,000 mAh LiPo charger but I will use it to charge up to 14.8V 8,000 mAh batteries. Will it charge the ...
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1answer
55 views

What is a good NiMH charger? [closed]

I have some (cheap/old?) batteries that I need charged. The problem is, the chargers I have keep charging them until they get overcharged and lose their capacity. I already ruined 4 ...
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2answers
90 views

Why one transistor switches on first than other

In the circuit diagram given below we have two transistors. And in the article it is given that one transistor will turn on first. Why this transistor turns on first
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81 views

homemade hub dynamo usb charger

I just made an usb charger to connect to my hub dynamo. ->voltage rectifier -> smoothing capacitor -> low voltage drop 5V regulator -> female usb port So now I can power / charge my mobile phone and ...
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4answers
171 views

Will voltage or current determine a diode drop for this battery charging circuit?

I am using a li-ion battery charger IC that regulates an output to 4.2V. I have a schottky diode in series with the output that then connects to the battery. How do I determine the voltage drop? If ...
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1answer
126 views

What do B+ and C+ mean on the wires of a Lifepo4 battery pack?

I bought this Lifepo4 battery pack. It came with its own charger. The seller told me the charger can be connected directly to the battery. There are 4 cables coming out of the battery: C+, C-, B+ and ...
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1answer
229 views

Efficient power utilization by MPPT battery charger

I am designing an MPPT solar charge controller to get more efficiency out of my system. At the moment I am at the conceptual stage and I have some questions about MPPT battery charging in general. ...
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1answer
180 views

Transmitting 12v DC over a long wire

I'm trying to charge my laptop through a 12V battery and 12-19V adapter over a long wire but I've noticed that the adapter makes some noise and doesn't work. On the other hand when I connect it close ...
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2answers
69 views

DC output of phone charger [duplicate]

I have a nokia phone charger which has the following specifications: Input: AC 100-240 V, 50-60 Hz, 100 mA Output: DC 5.0 V, 350 mA When I checked the output of the charger with a multimeter it ...
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115 views

LiPo combination usb/dc/solar charger + fuel monitor

I'm trying to roll several LiPo boards available on Sparkfun/Adafruit into one multipurpose board. Not a very ambitious project I know, but I'd really like an all in one. I've seen Sparkfun's LiPo ...
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1answer
62 views

Can someone tell me if this topology for a crude battery charger is sound? Block diagram included

I am making a portable phone charging battery for fun. I have a micro USB input that ties to a 5V - 4.2V buck converter to charge a li-ion battery. The IC is made to charge batteries so I think that ...
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1answer
129 views

Can I use a 7805 as a current regulator?

Can I use 7805 as current regulator? My input is 12-14 V DC (battery) and I require output 5V and 500mA or adjustable. My background is CS so unaware of these ICs. I have searched LM317 and LM338 but ...
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2answers
430 views

Is it ok to use an old phone as an universal battery charger?

We know that a charger is just an adapter that supplies a constant voltage (5 volts usually). The actual charging circuit is in the phone itself. With a bit of soldering and wiring, can I use my old ...
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1answer
332 views

Battery charging: Absorption Charge Stage

I need some help in understanding basic battery charging. I read about the three common stages: Bulk Charging, Absorption Stage and Float Stage, but I can't understand exactly what the controller does ...